Coated cutting insert for rough turning

(19)

(11)

EP 1 528 125 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	25.01.2006 Bulletin 2006/04

(43)	Date of publication A2:
	04.05.2005 Bulletin 2005/18

(21)	Application number: 04445110.2

(22)	Date of filing: 15.10.2004

(51)

International Patent Classification (IPC):

C23C 30/00^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
	Designated Extension States:
	AL HR LT LV MK

(30)

Priority:

27.10.2003 SE 0302842

(71)	Applicant: SECO TOOLS AB
	S-737 82 Fagersta (SE)

(72)	Inventors:
	Ruppi, Sakari 737 44 Fagersta (SE) Dahlund, Silvia 777 60 Söderbärke (SE) Zackrisson, Jenni 737 47 Fagersta (SE)

(74)	Representative: Taquist, Henrik Lennart Emanuel et al
	Sandvik AB, Intellectual Property 811 81 Sandviken 811 81 Sandviken (SE)

(54)	Coated cutting insert for rough turning

(57) The present invention relates to a cutting tool insert of a cemented carbide and a coating. The cemented carbide substrate comprises WC, 7-12 wt-% Co, 5-11 wt-% cubic carbides of metals from the groups IVb, Vb and VIb with a binder phase that is highly alloyed with cobalt. The tungsten carbide phase has a mean intercept length of 0.7 - 1.4 µm. The coating comprises at least one 2-12 µm thick α-Al₂O₃ layer composed of columnar grains with texture coefficients, TC(012) >2.2 and TC(104), TC(110), TC(113), TC(116) all <0.4.

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